Edward may caff all



I ilwrrc ATES a'rcivr Fries,

' EDW'ARD MAY CAFFALL, OF NEWV YORK. N. Y.

METHOD OF TREATING WATERPROOFED SUB FACES.

SPECIFICATION forming part of Letters Patent No. 577,283, dated February 16, 1897.

Application filed May 14, 1896.

To all whom, it may concern.-

Be it known that I, EDWARD MAY CAB-FALL,

, a citizen of the United States, and a resident of New York,

in the copnty and State of New York, have invented certain newand useful Improvements in Methods of Treating W'aterproofed Surfaces, of which the following is a specification. i My invention has relation to the treatment of waterprool'ed surfaces of brick, stone, or analogous porous material; and it consists in a new and useful method or process of removing the surplus or excess of fluid or melted paraflin or other waxy substances from the surfaces of matcrials'which have been waterproofed or preserved by said paraffin or waxy compounds, particularly (though not necessanily) when they have been applied by heating. Ileretofore the removal of the surplus or excess of the waxy compound has bten accomplished by using a solvent of such compounds, (after the treated surfaces have be- -come c001,) such as bcnzin or other hydrocarbon, and then using fatty substances or soaps to dissolve and mix with it and removing by washing; but this has been found to be slow and unsatisfactory. 'lhe waxy compound being usually white is not readily seen in crevices or carvings of stone Mn, such as white'marble and the like, and if any of the waxy substance is left upon the surface then in time this non-absorbed substance bocomcs sticky and is soon blackened by dirt, dust, &c., adhering thereto and is very difficult to remove. secure certain advantagosin facility and perfection. of operation as well as economy of time and labor I proceed as follows:

'When the surface to be treated has been sulliciently warmed so that it will absorb the waterproofing compound to the requisite depth, the said'compound is appliedthereon freely to insunethc best results. When this is done, and while the stone vor whatever is beingtre'ated is still hot, isprinklo or ruh upon the'surface a dry powder, such as whiting, marble-dust, magnesia carbonate, l'or marble andothor white stone or material; and in cases of colored stone or other treated material, a dry powder of similar color and preferably (though not ma-cssarily) ol. similarconstitucntsisemployed. 'lhon l rnwa nl To obviate these objcctitms, and to Serial No. 591,497. (No specimens.)

the powdered surfaces until the powder has completely absorbed the surplus compound that may have been left upon the'treated surfaces. The removal of this powder withthe water is made to take elfect only with great labor and difficulty, and then but unsatisfactorily. The facility of the final washing or rubbing with stone, sand, and water after my method is apparent and marked and results in a great saving of time and labor. The treated surface is by my method completely cleared of the waxy compound, thereby preventing future discolorations by dust &c., as heretofore mentioned; and the improved method obviates the use of solvents for the paral'lin, &'c. whichsolvents soften the waterproofing material and render it sticky and thus liable to catch foreign matters.

While I have described my method in conof heat, it is only because that is the prefer able and most approved way of waterproofing. The method is applicable in connection with anyof the cold processes, of course, but not with the same degree of satisfactory result, although to much advantage over the methods heretofore practiced. For instance, alter a cold surface has been treated it in be washed down with a solvent and the solvent and surplus sticky material removed by the application of the powdered material and by washing with water, sand, &c., as above oxplainml. 'lhe powdered material will greatly facilitate the washing and will produce a more perfect result than is possible without the powder.

Having now fully described my invention, what i claim as nowthercin, and desire to securo by Letters Patent, is-- l. The herein-described method of treating walcrprooled surfaces, the same consisting in. applying a waxy, absorbablc material, and upon this a powdered absorbing material, sufficient to take up the surplus waterproofingsuhsluncc, and then removingihe powder absorbed compound is quickly accomplished is washed with benzene, &c., as heretofore,-

nection with waterproofing by the application by Washing with Water, substantially as explained.

2. The herein-described method of treating waterproofed surfaces,

absorbable material in a heated state,

5 waxy,

consisting in applying terial while ing material thus app still heated, heating the absorblied, allowing it to cool,

and then removing the powder, substantially 10 in the manner explained.

Signed at; New York, in. the county and State of New York, this 23d day of April, A. D. 1896.

EDWARD MAY GAFFALL.

\Vitnesses:

W. J. MORGAN, WORTH Oseoon. 

